TINGKAT PENCEMARAN UDARA NOx DI JAKARTA PERIODE 1996 - 1998

The dominant air pollution in big cities is mainly caused by the transportation activity such as NOx, CO, VOC and particulate. Jakarta is the big city in Indonesia, as the centre of govermental, business, industrial activities and attracted the urbanisation, increasing population cause the larger energy consumption, for household, transportation, and other activities. The result of NOx measurement in JAkarta during 1996 - 1998 period shows that the NOx concentration in the centre of Jakarta was effected by climate. NOx concentration in dry seasons is large than in wet seasons. In period of March to September 1997, the NOx concentration was relatively higher due to the El Nino phenomena caused the long dry seasons, and no atmospheric washing by rain. The high level of NOx concentration in centre of Jakarta is around Gambir station about 38 - 168 ppb, while in istiqlal, Library building, Tebet, Senayan, and Casablanca are about 0.6 ppb - 54.5 ppb. In the out side of Jakarta, the NOx concentration fluctuated, seems to be unaffected by the seasons. Pulogadung, as the busy transportation and the industrial area, during 1997, the highest concentration of NOx was about 24-67 ppb, while in the other side of station was about 0.6-46.8 ppb. In 1998, the Nox concentration in Jakarta decreased significanttly due to the atymospheric washing process by rain, in addition to the decreasing of the amount of vehicle of about 20.55 percent from 1997. The high level of NOx concentration in centre of JAkarta indicated the transportation is dominant source of NOx. The highest-level NOx concentration occured in Gambir station, and the lower level occured in Istiqlal, Library building, of Senayan, Casablanca and Tebet.